Well, Bob McKenzie hasn't said it. It's more like whispers + some mock drafts going that way.
https://www.sportsnet.ca/hockey/nhl/nhl-top-15-mock-draft-lafreniere-lands-new-york/
^^^ Cam Robinson (mostly of Dobber Prospects, though I think he's trying to branch out) seems to be more dialed-in than most amateur scout blogger types, and while I suspect he's a dirty commie, I vaguely remember him being impressively ahead of the cuve about a few things re: the 2019 draft. If memory serves, he said Seider and Broberg would both go in the top ten and that the former would go before the latter. It's one of the reasons why I wasn't jaw-on-the-floor shocked when we took Seider at 6.
So, I'd say there's probably something to the Perfetti-to-Detroit talk. But at the same time, I don't think him playing in Saginaw and the Wings liking him a lot necessarily means a whole lot. Quinn Hughes was at UMich in his draft season and we didn't take him. Maybe Yzerman likes Perfetti more than Holland liked Hughes, but you get my point.
I guess I see Perfetti at 4 as a high-risk, high-reward proposition. The risk, I feel, is higher than I'd ideally like it to be, mostly because I don't like his straight-line skating and I don't like that he's a 5'10 guy whose straight-line skating I don't like. And I'm not confident he's an NHL centerman. But you'd be taking him for the potential payoff, and I do like the idea that he's a sleeper Datsyuk/Zetterberg/Pettersson. A player who's always the smartest guy on the ice, has an uncanny knack for slowing the game down, has great hands, is a great puck-protector, is lethal as a goal-scorer, is a lethal setup guy, always finds a way to manufacture offense, and is overall just a natural-born puck-possession beast.
I've been saying Yzerman needs to find a way to cheat and beat the rebuild prison system and score some massive victories, like getting a Pettersson outside the top 3. I've also said I hope there's a non-top-3 player in this draft that Yzerman and his people are over-the-moon about in the same way that the Canucks were over-the-moon about Pettersson — and that, ideally, this player has x factor qualities which are (secretly) so off-the-charts good that even if several aspects of his game are always going to be somewhat deficient, he's so overpowered in other areas that he's able to become a hugely and uniquely effective gamebreaker. Like Pettersson.